Remove local scripts, fix workflows, and add test coverage

[alari76]

Summary

• Remove local deploy/ops scripts (.codekin/scripts/) from the repo
• Fix empty repo list in AddWorkflowModal (missing auth token)
• Add repo-specific workflow discovery and dynamic workflow kinds API
• Fix shell injection in workflow-loader and silent errors on workflow actions
• Add comprehensive test coverage for workflow engine, loader, config, sessions, and helpers

Test plan

• Verify npm test passes with new test suites
• Open AddWorkflowModal and confirm repo list populates
• Trigger a workflow run and verify it completes
• Confirm deploy/ops scripts are removed from the repo

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